Choose the best answer.While he was doing homework, his sister _______(learn) English.

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Choose the best answer.

While he was doing homework, his sister _______(learn) English.

didn’t learned

was being learned

learned

was learning

Giải thích

Công thức: while + S was/were + V-ing, S was/were + V-ing

=>While he was doing homework, his sister was learning English.

Tạm dịch: Trong khi anh ấy đang làm bài tập về nhà thì chị gái anh ấy đang học tiếng Anh.

Đáp án cần chọn là: D